Polyester resin, method for producing polyester resin, resin composition, resin-clad fabric, and method for producing resin-clad fabric

Abstract

In order to provide a polyester resin having excellent flexibility, transparency, solvent resistance, heat resistance, and water resistance and capable of being used for a protective layer of a fabric, and a resin-clad fabric obtained by forming a layer of the polyester resin on a fabric, the present invention provides a polyester resin including: a dicarboxylic acid residue; and a glycol residue, in which the dicarboxylic acid residue includes a terephthalic acid residue (a), an aliphatic dicarboxylic acid residue (b) having 6 to 12 carbon atoms, and a dimer acid residue or hydrogenated dimer acid residue (c), the glycol residue includes an ethylene glycol residue or diethylene glycol residue (d) and a branched aliphatic glycol residue (e) having 3 to 9 carbon atoms.

The invention claimed is: 
     
       1. A polyester resin comprising, in a main chain skeleton, a dicarboxylic acid residue and a glycol residue,
 wherein the dicarboxylic acid residue includes a terephthalic acid residue (a), an aliphatic dicarboxylic acid residue (b) having to 12 carbon atoms, and a dimer acid residue or hydrogenated dimer acid residue (c), 
 the glycol residue includes an ethylene glycol residue or diethylene glycol residue (d) and a branched aliphatic glycol residue (e) having 3 to 9 carbon atoms, and 
 the polyester resin includes 30 to 50 mol % of the residue (a), 3 to 9 mol % of the residue (b), 1 to 5 mol % of the residue (c), 30 to 60 mol % of the residue (d), and 0.1 to 10 mol % of the residue (e), with respect to 100 mol % of the total amount of the residue (a) to the residue (e). 
 
     
     
       2. The polyester resin according to  claim 1 ,
 wherein the polyester resin includes 25 to 45 mol % of an ethylene glycol residue and 5 to 20 mol % of a diethylene glycol residue as the residue (d) with respect to 100 mol % of the total amount of the residue (a) to the residue (e). 
 
     
     
       3. The polyester resin according to  claim 1 ,
 wherein the residue (b) is an azelaic acid residue or a sebacic acid residue. 
 
     
     
       4. The polyester resin according to  claim 1 ,
 wherein the residue (c) is a hydrogenated dimer acid residue. 
 
     
     
       5. The polyester resin according to  claim 1 ,
 wherein the residue (e) is a neopentyl glycol residue or a dipropylene glycol residue. 
 
     
     
       6. The polyester resin according to  claim 5 ,
 wherein the residue (e) is the neopentyl glycol residue and the dipropylene glycol residue, and the polyester resin includes 0.1 to 3 mol % of the neopentyl glycol residue and 3 to 9% mol of the dipropylene glycol residue with respect to 100 mol % of the total amount of the residue (a) to the residue (e). 
 
     
     
       7. The polyester resin according to  claim 1 ,
 wherein the polyester resin includes 1 to 5 mol % of an azelaic acid residue and 1 to 5 mol % of a sebacic acid residue as the residue (b), 1 to 5 mol % of a hydrogenated dimer acid residue as the residue (c), 25 to 45 mol % of an ethylene glycol residue and 5 to 20 mol % of a diethylene glycol residue as the residue (d), and 0.1 to 3 mol % of neopentyl glycol residue and 3 to 9 mol % of a dipropylene glycol residue as the residue (e), with respect to 100 mol % of the total amount of the residue (a) to the residue (e). 
 
     
     
       8. The polyester resin according to  claim 1 ,
 wherein the polyester resin includes 35 to 45 mol % of the residue (a), 2 to 4 mol % of an azelaic acid residue and 1 to 3 mol % of a sebacic acid residue as the residue (b), 1 to 3 mol % of a hydrogenated dimer acid residue as the residue (c), 30 to 40 mol % of an ethylene glycol residue and 7 to 13 mol % of a diethylene glycol residue as the residue (d), and 0.5 to 2 mol % of a neopentyl glycol residue and 3 to 7 mol % of a dipropylene glycol residue as the residue (e), with respect to 100 mol % of the total amount of the residue (a) to the residue (e). 
 
     
     
       9. The polyester resin according to  claim 1 ,
 wherein a number average molecular weight obtained by gel permeation chromatography (GPC) method of the polyester resin is from 15,000 to 40,000. 
 
     
     
       10. The polyester resin according to  claim 1 ,
 wherein a glass transition temperature (Tg) of the polyester resin is from 5° C. to 30° C. 
 
     
     
       11. The polyester resin according to  claim 1 ,
 wherein the polyester resin is obtained by causing a reaction between terephthalic acid (A), an aliphatic dicarboxylic acid (B) having 6 to 12 carbon atoms, a dimer acid or hydrogenated dimer acid (C), ethylene glycol or diethylene glycol (D), and a branched aliphatic glycol (E) having 3 to 9 carbon atoms, in which a content of (A) is 30 to 50 mol %, a content of (B) is 3 to 9 mol %, a content of (C) is 1 to 5 mol %, a content of (D) is 30 to 60 mol %, and a content of (E) is 0.1 to 10 mol %, with respect to 100 mol % of the total amount of the (A) to (E). 
 
     
     
       12. A method for producing a polyester resin, comprising:
 causing a reaction between terephthalic acid (A), an aliphatic dicarboxylic acid (B) having 6 to 12 carbon atoms, a dimer acid or hydrogenated dimer acid (C), ethylene glycol or diethylene glycol (D), and a branched aliphatic glycol (E) having 3 to 9 carbon atoms, 
 wherein a content of (A) is 30 to 50 mol %, a content of (B) is 3 to 9 mol %, a content of (C) is 1 to 5 mol %, a content of (D) is 30 to 60 mol %, and a content of (E) is 0.1 to 10 mol %, with respect to 100 mol % of the total amount of the (A) to (E). 
 
     
     
       13. A polyester resin composition comprising the polyester resin according to  claim 1  and a hydrolysis inhibitor. 
     
     
       14. A resin-clad fabric obtained by disposing a layer of the polyester resin according to  claim 1  on a fiber fabric. 
     
     
       15. A method for producing a resin-clad fabric, comprising:
 applying the polyester resin according to  claim 1  on a fiber fabric to form a layer of the polyester resin on the fiber fabric. 
 
     
     
       16. A resin-clad fabric obtained by disposing a layer of the polyester resin composition according to  claim 13  on a fiber fabric. 
     
     
       17. A method for producing a resin-clad fabric, comprising:
 applying the polyester resin composition according to  claim 13  on a fiber fabric to form a layer of the polyester resin composition on the fiber fabric.